Wahl Comb 'N Cut the mistake free solution for well groomed hair. Unlike conventional clipper and trimmer blades, the innovative True Guard blade features a new design to allow gradual cutting and trimming. Because you simply comb through your hair until enough is cut, it's virtually impossible to make a mistake. The sleek, ergonomic design fits comfortably in the hand for easy maneuverability. Ideal for all types and texture of hair. Cuts only a few hairs at a time for a smooth, even, mistake-free style. Cuts without streaks, gashes, or cut lines. Just like combing hair. Use smooth, even strokes in a downward motion, in the direction that the hair grows. Takes about 10-15 minutes to achieve great hair.